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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea7880ae821508dc1157e566e5dd9cb946488439f76736d16299f71d02a293d' 
  AND token = '2RWfCkCVV02jACBck7fk0Rbe22TKYOunNJAF/KuvVOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}